Jaap Vente wrote :

>Do you want some references, Chem. Mater. 1997, 9, 552-9; Inorg. Chem.
>1998, 37, 6071.

I would prefer to get one or two of these patterns, if possible, thanks.

>> Using K alpha 1+2 is full of advantages, including higher flux,
>> lower cost.
>> 
>
>Sure! And you can allways fit a peak with consists out of two components,
>but at times you can be really struggeling to find out whether you see
>peak splitting due to alp1/alp2 or due to a slight reduction in symmetry
>or stcking faults. If you can rule out the machine straight away, than
>life becomes a bit easier.

You cannot always fit any peak which consists out of two
components when the position, shape and intensities of both
components are tied. You can fit if and only if your model is 
consistent with those constrained data.
Can you give your minimal FWHM, just to see how much your life
is easy ? With FWHM as low as 0.045 2-theta degrees, you 
already observe well the alpha-1 - alpha-2 peaks separately near 
of 40 2-theta degrees.

Best wishes,

Armel Le Bail - Universite du Maine, Laboratoire des Fluorures,
CNRS ESA 6010, Av. O. Messiaen, 72085 Le Mans Cedex 9, France
http://www.cristal.org/

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